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U-Boot 1.1.2 简单修改smdk2410.h

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工作开始了，先把U-boot解压缩到你喜欢的地方。然后打开Source Navigator，选择New Project。在接下来的窗口中，选择一个你喜欢的Project File的名字，然后在Add Directory里选择你把U-Boot1.1.2解压缩到的那个目录。再选择OK。然后等等，U-Boot这个变态的东西有143MB大……接下来出现了一个窗口。（5-23 SNAV启动）这个窗口里列出了U-Boot所有的源代码文件。上面的Pattern是为了便于你查找某个文件输入文件名的地方。

U-Boot是一种通用的Bootloader，它支持很多种不同的板子。我用的SBC2410X（友善之臂的）就是它支持的SMDK2410 开发板的一种衍生。U-BOOT同时支持自定义配置的开发板，具体的配置方法参见U-Boot目录下的Readme文件。U-Boot关于各种板子的配置文件放在/board目录下，我们的SMDK2410也在那里具体的目录是/board/smdk2410，其下有主要几个文件：flash.c——关于 NORFLASH操作的函数；config.mk——指定U-BOOT代码重新加载的基址；memsetup.s——汇编语言写的内存初始化程序，在 start.s中调用，以后介绍；smdk2410.c——SMDK2410目标板初始化等函数。还有一个重要的文件是在U-Boot目录 /include/configs下的smdk2410.h，包含了很多对目标板设置的宏。这几个文件中的配置与移植的目标板严格对应，如果你在 SMDK2410的基础上重新设计了目标板硬件，那就必须修改这些文件中的相关内容。

其实有了Source-Navigator这些文件的位置就变得无关紧要了，你只要在Pattern中输入你要查找的文件的前缀，文件就会列出在下面的列表中。你就输入smdk2410，回车，出现了2个文件：smdk2410.c和smdk2410.h，刚开始移植不需要搞太复杂的东西，只修改smdk2410.h就可以了。smdk2410.h的内容和要修改的地方（红色）如下：

/*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
* Gary Jennejohn <gj@denx.de>
* David Mueller <d.mueller@elsoft.ch>
*
* Configuation settings for the SAMSUNG SMDK2410 board.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public ****** as
* published by the Free Software Foundation; either version 2 of
* the ******, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public ****** for more details.
*
* You should have received a copy of the GNU General Public ******
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/

#ifndef __CONFIG_H
#define __CONFIG_H

/*
* If we are developing, we might want to start armboot from ram
* so we MUST NOT initialize critical regs like mem-timing ...
*/
#define CONFIG_INIT_CRITICAL /* undef for developing */

/*
* High Level Configuration Options
* (easy to change)
*/
#define CONFIG_ARM920T   1 /* This is an ARM920T Core */
#define CONFIG_S3C2410   1 /* in a SAMSUNG S3C2410 SoC      */
#define CONFIG_SMDK2410   1 /* on a SAMSUNG SMDK2410 Board   */

/* input clock of PLL */
#define CONFIG_SYS_CLK_FREQ 12000000/* the SMDK2410 has 12MHz input clock */

#define USE_920T_MMU 1
#undef CONFIG_USE_IRQ /* we don't need IRQ/FIQ stuff */

/*
* Size of malloc() pool
*/
#define CFG_MALLOC_LEN (CFG_ENV_SIZE + 128*1024)
#define CFG_GBL_DATA_SIZE 128 /* size in bytes reserved for initial data */

/*
* Hardware drivers
*/
#define CONFIG_DRIVER_CS8900 1 /* we have a CS8900 on-board */
#define CS8900_BASE 0x19000300
#define CS8900_BUS16 1 /* the Linux driver does accesses as shorts */

/*
* select serial console configuration
*/
#define CONFIG_SERIAL1 1 /* we use SERIAL 1 on SMDK2410 */

/************************************************************
* RTC
************************************************************/
#define CONFIG_RTC_S3C24X0 1

/* allow to overwrite serial and ethaddr */
#define CONFIG_ENV_OVERWRITE

#define CONFIG_BAUDRATE 115200

/***********************************************************
* Command definition
***********************************************************/
#define CONFIG_COMMANDS \
    (CONFIG_CMD_DFL   | \
    CFG_CMD_CACHE   | \
    /*CFG_CMD_NAND   |*/ \
    /*CFG_CMD_EEPROM |*/ \
    /*CFG_CMD_I2C   |*/ \
    /*CFG_CMD_USB   |*/ \
    CFG_CMD_REGINFO   | \
    CFG_CMD_DATE   | \
    CFG_CMD_ELF)

/* this must be included AFTER the definition of CONFIG_COMMANDS (if any) */
#include <cmd_confdefs.h>

#define CONFIG_BOOTDELAY 3
/*#define CONFIG_BOOTARGS      "root=ramfs devfs=mount console=ttySA0,9600" */
#define CONFIG_ETHADDR 08:00:3e:26:0a:5b
#define CONFIG_NETMASK           255.255.255.0
#define CONFIG_IPADDR   202.202.202.218

//你的开发板的IP地址
#define CONFIG_SERVERIP 202.202.202.118

//你的运行Linux的电脑的IP地址

//这些设定解决的是网络下载程序的问题
/*#define CONFIG_BOOTFILE "elinos-lart" */
/*#define CONFIG_BOOTCOMMAND "tftp; bootm" */

#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
#define CONFIG_KGDB_BAUDRATE 115200 /* speed to run kgdb serial port */
/* what's this ? it's not used anywhere */
#define CONFIG_KGDB_SER_INDEX 1 /* which serial port to use */
#endif

/*
* Miscellaneous configurable options
*/
#define CFG_LONGHELP /* undef to save memory */
#define CFG_PROMPT "LXZROB # " /* Monitor Command Prompt */

//开发板命令提示符，你可以改成你喜欢的任何字符串
#define CFG_CBSIZE   256   /* Console I/O Buffer Size */
#define CFG_PBSIZE (CFG_CBSIZE+sizeof(CFG_PROMPT)+16) /* Print Buffer Size */
#define CFG_MAXARGS   16   /* max number of command args */
#define CFG_BARGSIZE   CFG_CBSIZE /* Boot Argument Buffer Size */

#define CFG_MEMTEST_START 0x30000000 /* memtest works on */
#define CFG_MEMTEST_END 0x33F00000 /* 63 MB in DRAM */

#undef CFG_CLKS_IN_HZ /* everything, incl board info, in Hz */

#define CFG_LOAD_ADDR 0x33000000 /* default load address */

/* the PWM TImer 4 uses a counter of 15625 for 10 ms, so we need */
/* it to wrap 100 times (total 1562500) to get 1 sec. */
#define CFG_HZ 1562500

/* valid baudrates */
#define CFG_BAUDRATE_TABLE { 9600, 19200, 38400, 57600, 115200 }

/*-----------------------------------------------------------------------
* Stack sizes
*
* The stack sizes are set up in start.S using the settings below
*/
#define CONFIG_STACKSIZE (128*1024) /* regular stack */
#ifdef CONFIG_USE_IRQ
#define CONFIG_STACKSIZE_IRQ (4*1024) /* IRQ stack */
#define CONFIG_STACKSIZE_FIQ (4*1024) /* FIQ stack */
#endif

/*-----------------------------------------------------------------------
* Physical Memory Map
*/
#define CONFIG_NR_DRAM_BANKS 1 /* we have 1 bank of DRAM */
#define PHYS_SDRAM_1 0x30000000 /* SDRAM Bank #1 */
#define PHYS_SDRAM_1_SIZE 0x04000000 /* 64 MB */

#define PHYS_FLASH_1 0x00000000 /* Flash Bank #1 */

#define CFG_FLASH_BASE PHYS_FLASH_1

/*-----------------------------------------------------------------------
* FLASH and environment organization
*/

#define CONFIG_AMD_LV800 1 /* uncomment this if you have a LV800 flash */
#if 0
#define CONFIG_AMD_LV400 1 /* uncomment this if you have a LV400 flash */
#endif

//NORFLASH定义，使用的是1MByte的还是512kByte的

#define CFG_MAX_FLASH_BANKS 1 /* max number of memory banks */
#ifdef CONFIG_AMD_LV800
#define PHYS_FLASH_SIZE   0x00100000 /* 1MB */
#define CFG_MAX_FLASH_SECT (19) /* max number of sectors on one chip */
#define CFG_ENV_ADDR   (CFG_FLASH_BASE + 0x0F0000) /* addr of environment */
#endif
#ifdef CONFIG_AMD_LV400
#define PHYS_FLASH_SIZE   0x00080000 /* 512KB */
#define CFG_MAX_FLASH_SECT (11) /* max number of sectors on one chip */
#define CFG_ENV_ADDR   (CFG_FLASH_BASE + 0x070000) /* addr of environment */
#endif

/* timeout values are in ticks */
#define CFG_FLASH_ERASE_TOUT (5*CFG_HZ) /* Timeout for Flash Erase */
#define CFG_FLASH_WRITE_TOUT (5*CFG_HZ) /* Timeout for Flash Write */

#define CFG_ENV_IS_IN_FLASH 1
#define CFG_ENV_SIZE 0x10000 /* Total Size of Environment Sector */

#endif /* __CONFIG_H */

代码中红色的地方是我修改过的，可以对比原始的文件，就可以看出不同。

修改完了以后别忘了保存，然后到终端下面，输入

make distclean

……一堆E文飘过……

make smdk2410_config

Configuring for smdk2410 board...

make

……一堆E文连绵不断的飘过，你可以喝喝水，嗑瓜子……

如果没有错误的话，就会在U-Boot目录下生成U-Boot.bin文件。如果有错误，恭喜你，你的麻烦事情来了。只要你按照我这篇文章和上篇文章的步骤来做，不会有错误的。值得注意的是，必须使用U-Boot1.1.2和arm-linux交叉编译器 2.95.3 ，另外看看是不是之前路径没有设置，即

export PATH=/usr/local/arm/2.95.3/bin:$PATH没有输入，呵呵，还是没有研究明白SUSE的config怎么改。

生成的U-Boot.bin烧写到开发板的NORFLASH中，移植就完成了。烧写工具的下载地址是：http://www.samsung.com/Products/Semiconductor/SemiSecure/S02/MobileSoC/ApplicationProcessor/ARM9Series/S3C2410/SECJTAGFlashSJFNANDNORFlash_v4.zip

如果不能下载，到这个页面通过注册下载：
http://www.samsung.com/Products/Semiconductor/MobileSoC/ApplicationProcessor/ARM9Series/S3C2410/S3C2410.htm

下载时选择Utility中的SEC JTAG Flash(SJF) NAND,NOR(AMD,Strata) Flash。当然，如果你买了开发板，一般就会带有这个烧写程序了，不需费心下载，这里只是告诉你最本源的出处。

推荐在Windows的虚拟DOS环境中完成烧写，命令格式sjf2410 /f:u-boot.bin。烧写速度很慢，大约需要10分钟。烧写完成后，将启动选择跳线跳到NORFlash，重启开发板，串口就有输出了。串口调试工具推荐使用Windows自带的超级终端（程序〉附件〉通讯〉超级终端），下面是U-BOOT启动的提示信息：

U-Boot 1.1.2 (May 22 2006 - 02:30:03)

U-Boot code: 33F80000 -> 33F98380 BSS: -> 33F9C47C
RAM Configuration:
Bank #0: 30000000 64 MB
Flash: 1 MB
*** Warning - bad CRC, using default environment

In:     serial
Out:    serial
Err:    serial
LXZROB #

输入help可以看到U-Boot的操作指令列表：

?        - alias for 'help'
autoscr - run script. from memory
base     - print or set address offset
bdinfo   - print Board Info structure
boot     - boot default, i.e., run 'bootcmd'                                  bootd    - boot default, i.e., run 'bootcmd'
bootelf - Boot from an ELF image in memory
bootm    - boot application image from memory
bootp    - boot image via network using BootP/TFTP protocol

bootvx - Boot vxWorks from an ELF image

cmp      - memory compare
coninfo - print console devices and information
cp       - memory copy
crc32    - checksum calculation
date     - get/set/reset date & time
dcache   - enable or disable data cache                                       echo     - echo args to console
erase    - erase FLASH memory
flinfo   - print FLASH memory information
go       - start application at address 'addr'
help     - print online help
icache   - enable or disable instruction cache
iminfo   - print header information for application image
imls     - list all images found in flash
itest    - return true/false on integer compare
loadb    - load binary file over serial line (kermit mode)
loads    - load S-Record file over serial line
loop     - infinite loop on address range
md       - memory display
mm       - memory modify (auto-incrementing)
mtest    - simple RAM test
mw       - memory write (fill)
nfs      - boot image via network using NFS protocol
nm       - memory modify (constant address)
printenv- print environment variables
protect - enable or disable FLASH write protection
rarpboot- boot image via network using RARP/TFTP protocol
reset    - Perform. RESET of the CPU
run      - run commands in an environment variable
saveenv - save environment variables to persistent storage
setenv   - set environment variables
sleep    - delay execution for some time
tftpboot- boot image via network using TFTP protocol
version - print monitor version